2 month old doesn't show signs of hunger. Just screams

Erin
Does any one else's 2 month old not show signs of hunger any more? My lo use to root around or suck on his hands. He now wakes up and just cries until he eats. Or if he's awake and is hungry, he just cries. I would really like to feed him before he gets to that point but I never know when it is.